Undefined 'code' TypeError within errorNormalize

[rvajustin]

When running Apollo Server 4.10.1, I am running into an unhandled TypeError where extensions is undefined, so the error code cannot be retrieved from the object.

Here is the diff that solved my problem:

diff --git a/node_modules/@apollo/server/src/errorNormalize.ts b/node_modules/@apollo/server/src/errorNormalize.ts
index 55efdde..ecdb82d 100644
--- a/node_modules/@apollo/server/src/errorNormalize.ts
+++ b/node_modules/@apollo/server/src/errorNormalize.ts
@@ -60,11 +60,13 @@ export function normalizeAndFormatErrors(
 
     const extensions: GraphQLErrorExtensions = {
       ...graphqlError.extensions,
-      code:
-        graphqlError.extensions.code ??
-        ApolloServerErrorCode.INTERNAL_SERVER_ERROR,
+      code: ApolloServerErrorCode.INTERNAL_SERVER_ERROR,
     };
 
+    if (graphqlError && graphqlError.extensions && graphqlError.extensions.code) {
+      extensions.code = graphqlError.extensions.code;
+    }
+
     if (isPartialHTTPGraphQLHead(extensions.http)) {
       mergeHTTPGraphQLHead(httpFromErrors, {
         headers: new HeaderMap(),

[glasser]

As discussed at #7851 (comment) this issue only arises if you combine AS4 with a version of graphql-js that it explicitly does not support.

[github-actions]

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